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<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>

	var str='<p><djfk>fdjka</p>';
	
	var re=/[<>]/g;
	
	//console.log(str.replace('at','ding'));//cding bat sat fat
	
	//console.log(str.replace(re, 'ding'));//cding bding sding fding
	
	
	function repl(text){
		
		return 	text.replace(re, function(match, pos, originalText){
			
			console.log( match, pos, originalText )
			switch(match){
				case '<':
					return 111;
				case '>':
					return 222;
			};	
		});
	};
	
	console.log(repl(str));
	
</script>
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<body>
</body>
</html>
 